1. Chemical Reactions

2. Warm Up
What is the mass of this object, with the appropriate number of significant figures.

3. What Makes a Reaction Chemical?
Atoms are rearranged to form a new substance
Evidence of a chemical reaction:
Heat
Emitting
Absorbing
Light
Color change
Odor
Gas bubbles
Formation of a solid

4. Terminology Reactant: starting substances
Product: substances produced during the reaction
Symbols: +
Separates two or more reactants or products →
Represents the reaction, separates the reactants and products
Represents a reversible reaction, separates the reactants and products
(s)
Solid state
(l)
Liquid state
(g)
Gaseous state
(aq)
Water (aqueous) solution

5. Writing Chemical Reaction Equations
Reactant 1 + Reactant 2 → Product 1 + Product 2

6. Word Equations
Write a word equation that describes the reaction between Aluminum and Bromine
Determine phase of each element:
Aluminum is a solid (s)
Bromine is a liquid (l)
Write word equation:
Aluminum (s) + bromine (l) → aluminum bromide (s)
Reads as: Aluminum and Bromine react to produce aluminum bromide

7. Skeleton Equations Replace element names with chemical symbols
Indicate the number of atoms in the products
Determine the chemical symbols for reactants
Solid Aluminum = Al (s)
Liquid Bromine = Br2 (l)
Calculate chemical formula for products
Figure out ionization state for each element
Al +3
Br-1
Criss Cross charges to find number of atoms of each element
Al1BR3
AlBr3
Replace words with chemical formulas
Al (s) + Br2 (l) → AlBr3 (s)

8. Practice
Write a word equation and then skeleton equation for the following reactions:
Hydrogen and Bromine gas react to form hydrogen bromide
Carbon monoxide and oxygen react to form carbon dioxide

9. Types of
Chemical Reactions
Aluminum & CuCl2 by Mr. W

10. /Synthesis/
The get-together

11. /Synthesis/ The get-together Two or more chemicals bond together
forming one new substance.

12. /Synthesis/
The get-together
A + B  AB

13. /Synthesis/
The get-together
2Na + Cl2  2NaCl

14. /Decomposition/
The break-up

15. /Decomposition/ The break-up One substance breaks down into
two or more separate substances.

16. /Decomposition/
The break-up
AB  A + B

17. /Decomposition/
The break-up
2H2O2  2H2O + O2

18. /Single Replacement/
The cheater

19. /Single Replacement/ The cheater One element knocks another element
out of a compound.

20. /Single Replacement/
The cheater
AB + X  AX + B

21. /Single Replacement/
The cheater
2HCl + Zn  ZnCl2 + H2

22. /Double Replacement/
The swap

23. /Double Replacement/ The swap Two compounds switch ions
with each other.

24. /Double Replacement/
The swap
AB + XY  AX + BY

25. /Double Replacement/
The swap
BaCl2 + Na2SO4  BaSO4 + 2NaCl

26. /Combustion/
Everyone loves O2

27. /Combustion/
Everyone loves O2
A compound burns in oxygen gas.

28. /Combustion/ A + O2 Everyone loves O2
Oxygen will always be a reactant.
A O2

29. /Combustion/
Everyone loves O2
2Mg + O2  2MgO

30. Clicker Quiz Questions
For each reaction, select the type of reaction from the types that we just learned.
Options:
Decomposition
Synthesis
Singe Displacement
Double Displacement
Combustion

31. Question 1 2H2 + O2 -> 2H2O Decomposition Synthesis
Singe Displacement
Double Displacement
Combustion B

32. Question 2 2KClO3 -> 2KCl + 3O2 Decomposition Synthesis
Singe Displacement
Double Displacement
Combustion A

33. Question 3 Zn + 2HCl -> H2 + ZnCl2 Decomposition Synthesis
Singe Displacement
Double Displacement
Combustion C

34. Question 4 2S + 3O2 -> 2SO3 Decomposition Synthesis
Singe Displacement
Double Displacement
Combustion e

35. H2SO4 + 2NaOH -> Na2SO4 + 2H2O
Question 5
H2SO4 + 2NaOH -> Na2SO4 + 2H2O
Decomposition
Synthesis
Singe Displacement
Double Displacement
Combustion D

36. Question 6 Ca(OH)2 -> CaO + H2O Decomposition Synthesis
Singe Displacement
Double Displacement
Combustion A

37. Question 7 H2 + 2AgNO3 -> 2Ag + 2HNO3 Decomposition Synthesis
Singe Displacement
Double Displacement
Combustion c

38. Question 8 C10H8 + 12O2 -> 10CO2 + 4H2O Decomposition Synthesis
Singe Displacement
Double Displacement
Combustion E

39. Question 9 2Li2S + 2Cl2 -> 4LiCl + S2 Decomposition Synthesis
Singe Displacement
Double Displacement
Combustion B

40. Question 10 2Fe + 6NaBr -> 2FeBr3 + 6Na Decomposition Synthesis
Single Displacement
Double Displacement
Combustion C

41. Question 11 CH4 + 2O2 -> Co2 +2H2O Decomposition Synthesis
Single Displacement
Double Displacement
Combustion E

42. NaOH + KNO3 -> NaNO3 + KOH
Question 12
NaOH + KNO3 -> NaNO3 + KOH
Decomposition
Synthesis
Single Displacement
Double Displacement
Combustion D

43. CaSO4 + Mg(OH)2 -> Ca(OH)2 + MgSO4
Question 13
CaSO4 + Mg(OH)2 -> Ca(OH)2 + MgSO4
Decomposition
Synthesis
Single Displacement
Double Displacement
Combustion D

44. Question 14 2KClO3 -> 2KCl + 3O2 Decomposition Synthesis
Single Displacement
Double Displacement
Combustion A

45. Question 15 Pb + O2 -> PbO2 Decomposition Synthesis
Single Displacement
Double Displacement
Combustion E

46. Question 16 2Na + 2H2O -> 2NaOH + H2 Decomposition Synthesis
Single Displacement
Double Displacement
Combustion C

47. Question 17 6CO2 + 6H2O ->C6H12O6 + 6O2 Decomposition Synthesis
Single Displacement
Double Displacement
Combustion B

48. HCl + NaOH -> NaCl + H2O
Question 18
HCl + NaOH -> NaCl + H2O
Decomposition
Synthesis
Single Displacement
Double Displacement
Combustion D